How about a "points" attribute for objects?

sphere {  <1,5,7>, 6
    texture stuff
    interior stuff
    points {
        #declare pointA = < 1,1,8>;
        ...
    }
}
The vectors declared in the points {...} attribute would be accessible
like any other vectors, I'm sure there would be some way of having them
be accessed through the object itself, but that would require that each
object be named.
You could use any object, with this, and avoid invisible primitives.

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